Is there any other multi-platform SDK which I can use for both IOS and Android?

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I could not find any good service which provides their own server and SDK for both IOS and android. So finally I chose to go with my own server on AWS-EC2 + python tornado + Websocket. If anyone want to know more plz contact...

Well you could look into open feint's competitors such as scoreloop, AGON, plus+, etc. Theres many different options available online, some doing more than others. Perhaps you could elaborate on what you want so I or someone else could make a suggestion.